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  <div class="question_difficulty">
   难度：Easy
  </div>
  <div>
   <h1 class="question_title">
    633. Sum of Square Numbers
   </h1>
   <p>
    Given a non-negative integer
    <code>
     c
    </code>
    , your task is to decide whether there're two integers
    <code>
     a
    </code>
    and
    <code>
     b
    </code>
    such that a
    <sup>
     2
    </sup>
    + b
    <sup>
     2
    </sup>
    = c.
   </p>
   <p>
    <b>
     Example 1:
    </b>
   </p>
   <pre>
<b>Input:</b> 5
<b>Output:</b> True
<b>Explanation:</b> 1 * 1 + 2 * 2 = 5
</pre>
   <p>
    &nbsp;
   </p>
   <p>
    <b>
     Example 2:
    </b>
   </p>
   <pre>
<b>Input:</b> 3
<b>Output:</b> False
</pre>
   <p>
    &nbsp;
   </p>
  </div>
  <div>
   <h1 class="question_title">
    633. 平方数之和
   </h1>
   <p>
    给定一个非负整数&nbsp;
    <code>
     c
    </code>
    &nbsp;，你要判断是否存在两个整数
    <code>
     a
    </code>
    和
    <code>
     b
    </code>
    ，使得&nbsp;a
    <sup>
     2
    </sup>
    + b
    <sup>
     2
    </sup>
    = c。
   </p>
   <p>
    <strong>
     示例1:
    </strong>
   </p>
   <pre>
<strong>输入:</strong> 5
<strong>输出:</strong> True
<strong>解释:</strong> 1 * 1 + 2 * 2 = 5
</pre>
   <p>
    &nbsp;
   </p>
   <p>
    <strong>
     示例2:
    </strong>
   </p>
   <pre>
<strong>输入:</strong> 3
<strong>输出:</strong> False
</pre>
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